Susannah Mars

A horrible new predator creeps into Portland with its sight set on a young expectant couple who are close friends of Sgt. Wu (Reggie Lee). Nick (David Giuntoli) and Hank (Russell Hornsby) must figure out how to deal with Wu as the investigation escalates. Meanwhile, Adalind (Claire Coffee) prepares for a special delivery while her enemies are hot on her trail.

Nick (David Giuntoli) and Hank (Russell Hornsby) find themselves thrown into the middle of an ancient battle and things heat up when the Wesen Council decides to get involved. Monroe (Silas Weir Mitchell) and Rosalee (Bree Turner) fill everyone in on early Wesen history. Meanwhile, Sgt. Wu (Reggie Lee) is still reeling from the events he recently experienced. As things heat up in Europe, one of the Resistance’s most trusted allies gets compromised as he tries to protect Adalind (Claire Coffee).

After the world is morphed into a horrible and unrecognizable place - one where the Library never existed - it's up to Baird to bring the Librarians together before this bleak, knowledge-less world becomes the new reality.